Everybody loves a good sleep

Why do we “sleep tight”? 12 sleep-related idioms explained

Have you ever uttered the words "sleep tight" or "hit the hay" before going to bed? These phrases have existed for ages, but their meanings and origins are not always apparent. Some are directly related to sleeping, while others are metaphors for entirely different things. Take a look at 12 of these idioms. Do you use any of them?

"Sleep tight" is a phrase most people know from the bedtime verse: "Sleep tight, don’t let the bedbugs bite". It’s often claimed to come from the old practice of tightly tying ropes on bed frames to keep mattresses firm and comfortable. This helped prevent sagging and made for a better night’s sleep.

In older English, "tight" simply meant "soundly" or "well", making "sleep tight" a wish for a good night’s sleep.

"Hit the hay" dates back to the late 19th or early 20th century and is often linked to the practice of stuffing hay into sacks or mattresses for sleeping, which is also commonly cited as an explanation for the phrase "hit the sack."

Another theory suggests that farm workers sometimes slept directly in haystacks, making "hay" a stand-in for "bed." Because "hit the hay" appears in print slightly earlier than "hit the sack," some believe it may have come first.

Anyone who has had a newborn knows how strange the phrase "sleep like a baby" sounds: babies wake up often and cry! Yet, the idiom means to sleep peacefully and deeply.

The idea is that when babies do sleep, they’re completely at ease, with no worries to disturb them. That peaceful, undisturbed state is what the phrase refers to, even if it doesn’t match the full reality.

"Let sleeping dogs lie" might sound odd at first, but its meaning becomes clear with a bit of explanation. It’s a warning to leave past issues alone, especially sensitive ones.

The phrase compares old disputes to sleeping dogs: if you wake them, they might react aggressively. Similarly, revisiting old problems can stir up trouble best left alone.

A "catnap" is a short, light nap, usually under 30 minutes, during which you do not enter deep sleep. Studies suggest that even a 10-minute nap can be refreshing, sometimes nearly as effective as a longer one, though the ideal length varies by person.

The term comes from cats’ daytime sleep habits. Since wild cats had to stay alert for danger, they took quick, light naps. Today’s cats do the same, snoozing lightly throughout the day, just like a good catnap.

"Waking up on the wrong side of the bed" means starting the day in a bad mood. The phrase comes from an old Roman superstition.

Romans, including Augustus Caesar, believed getting up on the left, or sinister, side brought bad luck. As a result, the "wrong side" was more than just a bad mood starter; it was thought to be a bad omen.

To "sleep like a log" means to sleep deeply and without moving, like a heavy log lying still. It’s a common way to describe a peaceful, undisturbed night.

The origin of the phrase is unclear, but some link it to lumberjacks who slept soundly after hard work. Others connect it to the similarity between snoring and the sound of sawing.

"Counting sheep" means imagining sheep jumping over a fence, one by one, to help you fall asleep. It’s a classic mental trick to quiet the mind.

The phrase likely comes from shepherds who counted their flocks at night to ensure none were missing, a repetitive and calming routine before bed.

The idiom "to lose sleep over something" means to worry about something to the point that it becomes difficult to sleep, or to be so concerned that it disrupts one’s rest.

While the exact origin of the phrase is difficult to pinpoint, it likely evolved from the idea that intense worry and stress can interfere with the body's natural sleep cycle.

To "do something in your sleep" means to do something very easily and effortlessly, usually because you have done it so many times that it's become second nature. It's a metaphorical way of saying that you are so proficient at a task that you don't even have to think about it, as if you could do it while unconscious.

"Sleep with one eye open" means staying alert or cautious, especially in risky situations. It suggests being ready for trouble, even while resting.

The phrase is often linked to animals such as dolphins and certain birds that can literally sleep with part of their brain awake to remain safe.

To "sleep around the clock" means to sleep for many hours without waking. It often happens when you're exhausted or feeling unwell. It’s a way in which the body tries to recover energy.

Translation and interpretation

Was the forbidden fruit really an apple? 10 Bible surprises

What if some of the Bible stories you grew up with aren't exactly what the Bible says? Was the forbidden fruit really an apple? Were there actually three Wise Men? Did "God helps those who help themselves" really come from the Bible? Over centuries, translations, traditions, and famous works of art have added details that became so familiar, we stopped questioning them. But go back to the texts, and some of these stories look surprisingly different. From Eve's "apple" to the date of Jesus' birth, here are 10 familiar parts of the Bible that may not be quite what we remember.

When you picture the Garden of Eden, what fruit comes to mind? Most people imagine an apple, but there's just one problem: the Bible never says it was an apple.

In the Book of Genesis, the fruit is simply called "the fruit of the tree of the knowledge of good and evil." The original Hebrew text uses the word peri, which simply means "fruit." The apple connection came centuries later, largely through the Latin translation. The Latin word malum can mean both "apple" and "evil," making it an especially fitting symbol for the story. Over time, that association spread through Christian art and literature. Famous works such as Albrecht Dürer’s 1504 engraving Adam and Eve (also known as The Fall of Man) helped cement the image of Eve holding an apple. Today, it's one of the most famous scenes in history, even though the original biblical text doesn’t identify the fruit as an apple at all.

The story of Jesus' birth is so famous that most of us picture the Three Wise Men, sometimes called the Three Kings, standing beside the manger. But the thing is, over the centuries, the story picked up a few details that aren't actually in the Bible.

In the Gospel of Matthew, the only Gospel that mentions these visitors, they are described simply as Magi from the East. The original Greek word, magoi, referred to learned scholars, astrologers, or priests from Persia or Babylon, not kings. But where did the number three come from? Matthew lists three gifts: gold, frankincense, and myrrh, but never says how many visitors brought them. Over the centuries, people naturally assumed there must have been three Magi, one for each gift. Even their familiar names, Melchior, Caspar, and Balthasar, were added later by Christian tradition. So, neither the number of visitors nor their names appears anywhere in the biblical text.

Whether it's used to motivate a friend, encourage a family member, or push yourself to finally make a difficult decision, "God helps those who help themselves" is one of the most familiar religious sayings in America. But here's the surprise: those words never appear in the Bible.

The idea can be traced to ancient Greek sources, including Aesop’s Fables, where the saying appears in an earlier form: "The gods help them that help themselves." The exact modern wording was written by English politician Algernon Sidney in 1698, but it was Benjamin Franklin who helped make it part of American culture when he included it in his 1736 edition of Poor Richard’s Almanack.

Many teenagers have heard "Cleanliness is next to godliness" when it was time to clean their rooms. But despite sounding like a Bible verse, the phrase never appears in Scripture.

The Bible, particularly Leviticus, does contain extensive laws requiring people to wash their bodies and clothes in certain circumstances, especially before religious rituals. But the famous saying itself came much later. In 1605, Francis Bacon wrote in The Advancement of Learning that "cleanness of body" was connected to reverence for God. Then, in 1786, it was Methodist leader John Wesley who used the wording we recognize today in a sermon: "Cleanliness is indeed next to Godliness." Over time, the phrase became a familiar saying that many people simply assumed came from the Bible.

When it comes to famous dates, December 25 may be the most recognizable of all, universally associated with Christmas. But here's the surprising part: the Bible never gives any specific date for Jesus' birth.

The Gospels of Matthew and Luke describe the Nativity but never provide a calendar date, so how did December 25 become Christmas? There are two leading theories. The first is that the Roman Church was celebrating Christmas on December 25 by 336 AD, during Constantine's reign, possibly choosing the date to coincide with existing Roman winter festivals and make it easier to convert the empire to Christianity. The second points to an early Christian tradition that calculated Jesus' birth date from the supposed date of his crucifixion, eventually arriving at December 25.

The story of Jonah and the Whale is so famous that it has appeared literally or symbolically in innumerable works of art and literature, from Michelangelo's Sistine Chapel ceiling (1508-1512) to Herman Melville's 1851 novel Moby-Dick. But there's a small problem with the title we've given it: the Bible doesn’t actually say it was a whale.

In the Old Testament, the original Hebrew text of Jonah 1:17 uses the words dag gadol, meaning "great fish" or "large fish"; it doesn't identify the creature as a whale, or even specify what kind of fish it was. Most modern English translations therefore stick with "great fish," but the familiar "whale" interpretation developed through older translations and later European tradition, eventually becoming so widespread that "Jonah and the Whale" became the name almost everyone recognizes.

Just as we've always pictured the forbidden fruit as an apple, many of us also assume the serpent in the Garden of Eden is the devil himself. But the original story is a little more complicated.

A plain reading of Genesis depicts the creature simply as a serpent or snake, using the Hebrew word nachash. It describes the serpent as clever and crafty, but it never calls it Satan or explicitly identifies it as the devil. So where did the connection come from? The answer comes from later parts of the Bible, particularly the New Testament. In Revelation 12:9 and 20:2, Satan is called "the ancient serpent" (ho ophis ho archaios in Greek), connecting him to the snake of Eden. Over time, Christian tradition applied that later connection back to Genesis, leading to the familiar belief that the serpent was Satan himself.

Many of us remember Samson for his legendary strength and the long hair that was said to be the source of his power. His story with Delilah is one of the Bible's most famous tales of betrayal, but there's one detail some people may have gotten wrong: Delilah didn't actually cut his long hair.

In Judges 16:19, Delilah has Samson's hair shaved while he sleeps on her lap. The text says she called for a man to do the shaving; it never says she did it herself. Yet paintings, films, and other retellings have often shown Delilah wielding the scissors herself, cementing that image in popular culture. It can be considered a small detail, but it’s a great example of how easily familiar Bible stories can pick up elements that aren't actually in the original text.

Many of us think of the Bible as a single book, written at one particular time by one author, or perhaps a handful of them. After all, that's how it looks when you pick one up in a hotel room, but its history is far more complicated.

The Bible is actually a collection of books written by over 40 authors over roughly 1,500 years, from about 1400 BC to AD 100. The exact number of books varies by religious tradition: Protestant Bibles contain 66 books, while Catholic and Orthodox traditions include additional books. Across these different traditions, the writings were produced by kings, prophets, fishermen, and scholars in Hebrew, Aramaic, and Greek. They also span a tremendous range of literary styles, including history, poetry, songs, laws, letters, and prophecy. So while we hold it as one book today, the Bible is actually a collection of many different writings produced across centuries.

Many people assume that at least a few original fragments of the Bible must still exist somewhere. It would be incredible if they did, but none of the original manuscripts, known as autographs, have survived.

The earliest biblical texts were written on fragile materials such as papyrus and animal skins, which could deteriorate through humidity, heat, handling, and simple age. Wars, fires, and other destruction also contributed to their disappearance. So how do we know what the originals said? Through a technique called textual criticism: expert scholars compare thousands of handwritten copies, ancient translations, and quotations from early Christian writers. When they find passages that match across different sources, or differences that reveal how a text changed over time, they can work backward to determine what the original most likely said, even though the original manuscripts themselves are gone.